Abstract: A cable block device which is capable of clamping upon a strand of any conventional diameter and which is capable of retaining a cable or cables of any conventional diameter. The cable block device includes a bracket which hooks over a strand to support the bracket. A shaft which extends through the bracket has a lever attached thereto. A cam is also attached to the shaft. The lever, the shaft, and the cam rotate together. A portion of the cam is engageable with the strand which supports the bracket to establish clamping action of the cam upon the strand. A roller is also attached to the bracket and is rotatable with respect to the bracket to support a portion of a continuous cable or cables.An arm is attached to the cam for pivotal movement of the arm with rotative movement of the cam. The arm extends from the cam and has a retainer portion. The retainer portion of the arm is movable to a position spaced from the roller, to permit positioning a portion of a cable upon the roller.